<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .container,.left,.right{
            height: 100vh;
        }
        .container{
            display: flex;
            /* flex-direction: column; */
            /* width: 200px; */
        }
        .left{
            background: red;
            /* width: 300px; */
            flex-shrink: 0;
            flex-basis: 300px;
        }
        .right{
            background: green;
            flex: 1;
        }
    </style>
</head>
<body>
    <!-- css如何实现左侧固定300px，右侧自动 -->
    flex-basis 和 width 相同点和不同点
    <div class="container">
        <div class="left"></div>
        <div class="right"></div>
    </div>
</body>
</html>